Plowshare



PatentedMay 17, 192

Uui'rtzn STATEs PATENT v 6Fl-4g:

ommen n. wien, or ritrrsnunen, rENNsYLvANfA, nssreuoa To cnncInLn STEELconm or Amica, a conrgm'rron or NEW Jnnsnrl rnowsnnnn I .Applicationiisd october 9 Heretnf'ore plowshares have commonly been made ofso-ealled soft-center steel,

'meaning essentially a laminated composite carbon content which ishardened. In such prior soft-center plowshares theV inner lowcarbonsteel layer has `extended throughout the length of the share; leavingthe said in` ner layer exposedalong the edge of the nose and at thenose-point, -altho h in some cases thin pieces or Shins of har steelhave been welded above and below, and sometimes on opposite sides of,the npse of the share. In al1 such cases the hardened steel outer layers(one or both) at the nose, and particularly at and near the' point ofthe nose, lwear away more or le rapidly, thus exposing the inner softlayer directlyto by stones in the ground, and then the plowshare is soonworn ont. It is the object of the present invention to improve theplowshare in the respects, and thus to provide one a naterially l'ong-1929. Serial N0. 898,277.

being indicated by the numeral' 2, and the:v high-'carbon envelopel bythe numeral '3.'

Heretofore'in the manufacture of a plowl share from a composite steelplate such'as is shownin Figure 1, ithas been the practice -to-shearoii, along the dotted lines 4, 4, the1 opposlte solid high-carbon edgeportions 5, 5v

of the composite plate, thus leaving the opposlte edges ofthe innerlow-carbon layer 2 exposed, and then cut the blank for the plowsharefrom the -sheared plate. In the manun I facture of my improvedvplowshare -by the procedure now being described I do not shear away thehigh-carbon edges 5, 5, but I leave the composite plate 1 intact atl itsedges, and

I cut out of itv (as shown by the shaded orl tions and by thedottedlines 6) the bla l7,

one of which is shown in Figure2, with *the4 -edges of the low-carboninner layer 2 exposed upon three sides, and its end taken from the solidhigh-carbon edge portion 5 of the composite plate 1. The blank 7 is thenforged in the usual way to form the lowshare 8 `shown in Fi ures 3 and4, the igh-carbon "solid edge 5 orming the nose 5 of the plowshare, thenose-point 9 and the lower blade 10 er eeetive life, while not impairingthe being sharpened, and the plowshare then submitted to the hardeningoperation. There is'thus formed a lowshare having the solid pelspectl``ve view of a plowshare embod g the invention, which has been formed omthe blanl'r shown in Figure 2; and Figure 4.

is a. view in cross-section taken on the line IV--IV of Figure 3. Itunderstood igures 1 and2areonly illustrative, and no attem pt ataccurate scaling4 has been ma e.

The composite steel plate lof ,has

i been rolled down from a composite mgot having Ta low-carbon core and aenvelope ofhigher carbon steel, as 1s a well known-practice, thelow-carbon layerA hard steel nose 5 forward of the dotted line 11,Figure 3) and the rearwardly extendin laminated steel bOdy`, composed ofthe so and tough center 2.and the opposite hard faces 3, 3.

upon the'inner side face of the nose portion o the plowshare aheel orso-called gunwale It has been the practice heretoforeto weld.

12, the'ilange 13 of which has been only of a widthsuicient to giveA afirm weld. Itis a part ofthe present invention to extend the width ofthis welded flange portion 13A of-the '-mwale beyond the. dotted line 11of theont edge of the soft center2 of the plowshare, to aboutithe,extent indicated the dottedline 14 of Figure 3, so that' it will@reinforce vthe union between the hard steel nose and the front edge of'the inner layer of the plowshare. L v p The terms low-carbon or softsteel and high-carbon o r hard steel, are used herein in a relativeisense only. The so-called soft center 2 of the laminated metal platemetal layer. The portions 3 and 5 of the plowshare will have a carboncontent higher than that of the center layer 2, and consevmgquently willbe harder, being preferably gral illing projecting rearwardly from Saidmay be of iron, or of any Steel so low in carbon contentl as not to behardened or only slightly hardene'dby heat treatment, so that it willconstitute a tough supporting inner hardened by heat treatment' intheusual way.

No claim is made herein tothe method of manufacture of lowsharesdescribed the foregoing speci cation since the method is made thesubject of a separate, divisional application for Letters Patent, led byme on September 3rd, 1931, Serial No. 560,906.

l claim as myuinvention:

A plowshare comprising a solid nose and rearward y projecting oppositewings formed,v

of hard steel, a relatively softA metal intei* nose between said wings,and a gunwale having a flange united to aside face of said nose andextending rearwardly beyond the. line of jiincture of said nose withsaid soft metal filling.

In testimony 'whereof have hereunto set l my hand. Y a

CLARENCE E. WISE.

